In a very short scene, Debra drops in on Anton, while he's in a funky café, to ask him about Quinn.

She has heard rumors that he's a bad cop, and wants to know for sure.

After
some opening banter about Anton's guitar, she tells him that she is
confused about Quinn, and wants to know if he is "a good guy or a bad
guy?"

Anton asks her: "Does it have to be either/or ?"

Deb replies: "In my world, yeah."

Anton tells her that all he knows is that Quinn helped him out of a jam when he was in trouble.

We see this same cafe again in Episode 7 of Season 3, in yet another
scene of Deb and Anton talking. This time, he's tells her that
he's willing to be her "bait" to trap the Skinner.

Q.
What is it actually in real life?

A. A café / coffee shop, specializing in Mediterranean cuisine.

Q.
Where can I find it in real life?

A. This is the The Mirage Cafe, located at 539 E. Bixby Road, in Long Beach, CA.

It
bills
itself as a Mediterranean Grill, serving Middle Eastern dishes
such as shish kabob, shawarma, falafel, and vegetarian items.
It's located in a row of storefronts on the north side of street, just
west of Atlantic Ave.

And
yes, the colorful interior decor looks almost as funky as it does on
the show. Most of the items you see in the scene are actually
there. The set directors did bring in a few things, threw down a couple
of rugs, and rearranged a few pieces of furniture that were already there. But
the general effect is mostly the same.

If you're curious about the exterioropening establishing
shot, seen in the episode just before they show the interior of this
restaurant, that was simply stock footage of the southwest corner of
8th Street & Ocean Drive, in Miami Beach. The white building
seen on that corner in the shot is known as Wet Willie's, and is at 750 Ocean Drive.

Q.
How the heck did you figure out where it was?

A. Since
this was strictly an interior scene (they faked the exterior shot),
there were few clues to go on. The interior was obviously unique,
looking more like a living room that a typical cafe, but I
couldn't even be sure that the decor was real, and not just some set
designer dressing of an empty building. So my search for the café led nowhere, and I probably never would have found it on my own.

Fortunately, three years later, in 2011, as I was beginning work on the 6th season, I got an email from a fan, Kyle Disotell, letting me know that it was the interior of the Mirage café. (Thanks Kyle!)

Kyle sent me a photo of the interior he had found online, and then I tracked down several other photos (from their webpage), and was able to match enough items in the room to be certain that it was the same place.

The matches
include the multicolored, checkered counter (top photo), the arching
doorways,
the hanging lamps, and the dark bookcase seen behind Anton
(bottom photo).

I've circled some matching items in red, in the photo blow-ups below.

The photo on the left
is taken from the show.

The photo on the right
is of the Mirage café.

Note those five small decorative items on the wall, right above the
checkered counter. They match up
perfectly with the same items seen in that "Dexter" scene.